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Reduced expression of fukutin related protein in mice results in a model for fukutin related protein associated muscular dystrophies.

Authors:Ackroyd, M R, et al.
Citation:Brain, 132: 439-51 (2009)
Pub Med ID:19155270
Year:2009
Abstract:Mutations in fukutin related protein (FKRP) are responsible for a common group of muscular dystrophies ranging from adult onset limb girdle muscular dystrophies to severe congenital forms with associated structural brain involvement, including Muscle Eye Brain disease. A common feature of these disorders is the variable reduction in the glycosylation of skeletal muscle alpha-dystroglycan. In order to gain insight into the pathogenesis and clinical variability, we have generated two lines of mice, the first containing a missense mutation and a neomycin cassette, FKRP-Neo(Tyr307Asn) and the second containing the FKRP(Tyr307Asn) mutation alone. We have previously associated this missense mutation with a severe muscle-eye-brain phenotype in several families. Homozygote Fkrp-Neo(Tyr307Asn) mice die soon after birth and show a reduction in the laminin-binding epitope of alpha-dystroglycan in muscle, eye and brain, and have reduced levels of FKRP transcript. Homozygous Fkrp(Tyr307Asn) mice showed no discernible phenotype up to 6 months of age, contrary to the severe clinical course observed in patients with the same mutation. These results suggest the generation of a mouse model for FKRP related muscular dystrophy requires a knock-down rather than a knock-in strategy in order to give rise to a disease phenotype.
Species:Mouse

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